Occurrence of chiral organochlorine compounds in the environmental matrices from King George Island and Ardley Island, west Antarctica

• Main Authors: Wang, Pu, Zhang, Qinghua, Li, Yingming, Zhu, Chaofei, Chen, Zhaojing, Zheng, Shucheng, Sun, Huizhong, Liang, Yong, Jiang, Guibin
• Format: Report
• Language: unknown
• Published: 2015
• Subjects: Multidisciplinary Sciences; Ardley; Ardley Island; King George Island; West Antarctica; Antarc*; Antarctica
• Online Access: http://ir.rcees.ac.cn/handle/311016/32631

Chiral organochlorine compounds (OCs) were measured in various environmental matrices (air, soil and vegetation) from west Antarctica using high resolution gas chromatography coupled with high resolution mass spectrometry (HRGC/HRMS). They were generally detected at a global background level compared with the previous studies. alpha-HCH and PCB-183 was observed in all the matrices except PCB-183 in two soil samples, while PCB-95, -136, -149, -174, -176 and o,p'-DDT were detected in most air but only a few solid matrices. Enantiomeric fractions (EFs) indicated that nonracemic residues of chiral OCs occurred in all the matrices and a wide variation of the EF values was observed in the vegetation. There was significant discrepancy between the EF values of PCB-183 and the racemic values, indicating that stereoselective depletion of PCB-183 was probably associated with the water-air exchange. The EFs values of alpha-HCH were generally lower than the racemic values but no statistical difference was obtained in all the matrices except lichen, supporting the assumption that water-air exchange may make influence on long-range transport of alpha-HCH.